Malicious PDF — malware analysis report

Static analysis result for SHA-256 af527a62b887c9de…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 14:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca75c2317b37f0747835a2c1cd4e5474 SHA-1: 5e48d7e23f60d7704824cbce0b82e86ca67277de SHA-256: af527a62b887c9de932e59a3b830accbc4d3ecd6448db0c108bf67ea0fd5dc2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/90e50528d02008fd5e2c27a2299a9cff/77290214065.pdf In PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/mijedopowogomotul.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/jijerivugogukurixuwivigez.pdfIn PDF document text
    • http://scantech3d.com/files/zoxituvekugu.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091519492029.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/boleriximovo.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210909231629.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/1709512416.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/14204167204.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/mafasepo.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/sisifatubipamuv.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/zikikimagivekule.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/kikoko.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/gutok.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/17976356062.pdfIn PDF document text
    • http://hkalc.com/userfiles/33981211166.pdfIn PDF document text
    • https://digireg.pl/upload/90395785686.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/wifuz.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/mibuvapujovegoz.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/1a707dd4fe6a72d79a9c33ab0a99250f/jidufawekuvudubi.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/48003849738.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/39069115935.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d62527354---pozoresazexizakaza.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368d2b4e95a---732624716.pdfIn PDF document text
    • http://zubrcup.by/files/files/64277300334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=underscore+on+android+keyboardPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 10572 bytes
SHA-256: 352cef57bf73a49726ad72ba602cc94b2f7dd7d0a0f5f75fc8b63fe8762c9f9c
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 18844 bytes
SHA-256: 5489cad889af3172d77015ce1269b5b94041d7a5ab6a222b157af9f3ecde7c1d
font_02_sfnt_off0001329d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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